1. Department of Clinical Sciences, Copperbelt University, School of Medicine , Ndola , Zambia
2. Department of Pharmacy, University of Zambia, School of Health Sciences , Lusaka , Zambia
3. Department of Pharmacology, Eden University, School of Pharmacy , Lusaka , Zambia
4. Clinical Research Department, Faculty of Infectious and Tropical Diseases, London School of Hygiene & Tropical Medicine , London , UK